01 / The world before
Precise navigation required accounting for different clock behavior.
02 / The discovery
Relativity explained effects relevant to satellite timing.
03 / The people
Einstein and generations of satellite engineers.
04 / The obstacles
Real-world systems require calibration and continuous correction.
05 / The world after
Precision timing became part of location infrastructure.
06 / Why it still matters
Physics can shape an ordinary trip across town.